Defines the thickness of the nozzle reinforcing pad, when it exists and when the software must consider it in calculations. If you specify a pad thickness in this box, the software uses the value to increase the thickness of the tank shell in all Appendix P calculations.
Specifying a repad thickness in this box can duplicate assumptions made by Appendix
P, and it is not advised in most circumstances.
Appendix P of API-650 does not specify how to handle reinforcing pads. References
used when developing Appendix P indicate that when selecting the curves for reinforcing
on the shell, you should automatically assume the nozzle has a pad with a thickness
equal to the shell thickness.